What is the name of the warm and dry wind that originates on the west coast of the United States, crosses the Rocky Mountains and descends on the other side?
This wind is the Chinook. It is a regional wind of the Pacific Northwest and the Rocky Mountains. It starts as a moist maritime air mass from the Pacific Ocean. After being forced over the mountain ranges and losing its moisture, it arrives on the eastern slopes as a warm, dry and fast-moving wind that significantly alters the local winter weather. ANSWER: (A) Chinook
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The Chinook is a classic example of how geography influences wind. When air from the West Coast is pushed upward by the massive Rocky Mountains, it cools and releases rain. This is why the western side of the mountains is so green. However, the air that makes it over the top is now dry. As this air falls down the eastern side, it gains heat through pressure. This warm air replaces the heavy, cold air sitting on the plains. This process is so efficient that it can make a freezing winter day feel like a warm spring afternoon in minutes.
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